% slitherlink 388 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/388.a.htm
slitherlink
very hard
30 20
3.22.22.2.1..1.2..2.13.223..3.
...202..23...2.12222231.2.21..
1.2....21..2.1.23.....3221....
...1..2.123...22222......222..
.12.21.1.1..222...23.21.22.222
2....13..22.01.....2.312.3....
2.3.1...221.22...1....321.23..
1.132.21..2.3..1..33.1.2...1.1
.3.1..02..112..3.31..33...2...
..1.32..2...2......3.1.....3.3
.232.1.....2.223.22..1.....1.2
..22.2.2..2.22.11111......3.22
.321..2.......3...2...11...22.
12.2...2..112.12.2..22022.3..1
..222.21.31..3.........2.2.2.2
.2....2..2.2...2.2.3.3.2201.2.
..2..21..1......3....3.2......
.2..13.2322313.22.2.032.......
3.......2.2.1..3232...1312.13.
.2232231..2.2.1...322.2...3.3.
